Dental handpiece.



PATENTBD MAR. 19, 1907.

H s MILLER DENTAL- HANDPIEGB.

APPLICATION FILED-JUNE Z2. 1904.

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DENTAL HANDPIECE.

Speccation of Letters Patent.

Patented March 19, 1907.

Application iled June 22,1904. Serial No. 213.583.

To MZ 'Lu/1,0711, t T11/ty con/cern:

Be it known that I, HENRY S. MILLER, of

Rochester, in the county of Monroe and State of N ew Y ork, have invented certain new and useful Improvements in Dental Handpieces and 1 do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specnication, and to the reference-numerals marked there- My present invention relates to dental handpieces, and struments adapted for performing operations of burring and plugging 3 has for its object to provide an improved form of chuck or holder adapted to secure diii'erent instruments in operative position and which is capable of being operated to permit them to be quickly .inserted or removed from the handpiece.

To these and other ends my invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings, Figure 1 is a side elevation of the handpiece constructed in accordance with my invention, the casing being shown in section to better illustrate the interior arrangement of the various parts. Fig. 2 is a longitudinal sectional view on the line 2X 2X of nig. l. Fig. 3 is a similar enlarged view illustrating the manner of inserting a tool. Fig. 4 is a sectional view on the line 4X 4X of big. 3, showing a tool locked in position. Fig. 5 is a perspective view of the tippiece. Fig. 6 is a similar view of the chuckoperating member or sleeve movably mounted in the tip-piece. Fig. 7 is a perspective view of the adj usting-collar of the tool-chuck. Fig. 8 is a detail sectional view taken on the same plane as Fig. 3 and showing a tool in the locked position. Fig. 9 is a cross-sectional view on the line 9X 9i of Fig. 2, and Eig. 10 is a similar view on the line 10X 1() of l* ig. 3.

Similar reference-numerals in the several figures indicate similar parts.

In illustrating my invention l have shown the handpiece consisting of the tubular casing or shell 1, in which is journaled the driving shaft or spindle 2, operated by any'suitable form of motor device attached to the end of a flexible shaft At its -rear end ithe spindle 2 is journaledinlthelbearingllgproparticularly that form of inl the dllll attached to the spindle,

and 1t reduced in diameter and j vided with a screw-thread, as shown, and secured in the rear end of the handle 1. The spindle is prevented from longitudinal movement in the handle by means of collars 5 and l 6 thereon located at the inner and outer ends of the bearing 4. The forward end of the shaft is provided with a central tubular aper- 1 ture adapted to receive the shank of a tool 7, j which at its rear end extends laterally, opening at the side of the spindleto receive a key or locking device 8, as will be further described.

ln order to permit the tools to be rigidly its forward end is split to form the jaws 9, which are movable relatively to each other. by means of an adjustable collar 10, ll threaded on the spindle and provided with an inner conical surface cooperating with a similar surface on the jaws, as will be understood. To permit the chuck to be readily j opened and closed, l employ an operating member in the form of a sleeve 11, inclosing l the collar 1() and movable into engagement l therewith by a relative longitudinal adjustl ment in the shell or casing 1. The sleeve is supported in the tubular tip-piece 12, rigidly secured in the end of the casing and provided with rearwardly-extending projections 13, engaging in recesses 14, formed in an annular enlargement or head 15 at the rear end ofthe l sleeve 11. These projections 13 form guides on the casing or shell, which engage the sleeve and permit it to be moved relatively inwardly and outwardly in the tip-piece and preventing its rotary movement therein. The outer end of the sleeve is closed by a perforated cap 16, the inner end of which is provided with a plurality of lugs or projections 17, adapted to engage between corresponding lugs or projections 20 on the end of the collar 10, whereby the latter may be held stationary during the rotary movement of the spindle in either direction to open or close the jaws 9 of the chuck.

As the handpiece is also adapted to be used for pluggin operations, the cap 16 is l provided with t readed steps 21- and 22, adapted to receive the shanks of differentl sized plugging instruments, and to this end thewhandpiece is also provided with a-hamj mer,which may be controlled at the will of th e operator ton automatically cause blows l or concussionstobe transmitted to the plugging instrument. In the present instance l this hammer consists of a sleeve 23, encircling IOO IIO

. pendently of the spindle and held in position thereon by means of a stud or screw 24, projecting from said spindle into an elongated aperture 25 in said sleeve. The hammer is held in its forward position, as shown in the several iigures, by means of a coil-spring 30, and as the forward end of the hammer abuts against the end of the head l5 of the sleeve 1l it forms means for normally holding the sleeve projected forwardly, so that the lugs 17 thereon are held out of engagement with the projections 20 of the collar l0, yet permitting the operating member or sleeve to be moved rearwardly when it is desired to adjust the chuck.

The hammer is provided with a spiral shoulder 31, forming a cam, with which a projection 32 on the spring-finger 33 is adapted to coperate, said iinger being also provided with a projection 34, adapted to lie in rear of the sleeve l1 when the hammer is retracted to prevent the rearward movement of the sleeve. The strength of the blows delivered by the hammer may be regulated by increasing or decreasing the tension of the spring 30, which is accomplished by an adjustment oi?l the nut 35, threaded on the spindle, against which the rear end of the spring rests. rlhis nut is provided with a series of peripheral notches or depressions 36, with which -coperates a ii'nger 37 on the rearwardly-extending end 33 of the -inger 33, which holds the nut stationary, whileit is caused to travel longitudinally on the spindle by the rotation thereof in one direction or the other, as will be understood.

'The burring-tools may be secured to the spindle by the chuck, land while this method of securing them permits tools having Shanks of various diameters' to be employed I provide further means for securing them indesaid chuck, whereby an operator after adjusting the handpiece to receive the tools of the size with which he may be supplied it is unnecessary to change the adjustment of the chuck save to accommodate tools of greater or less diameter. For this purpose the extremity of the tool-shank is cut away at one side to ferm a face 39, which is inclined slightly to the axis of the tool, and a shoulder 40, as shown particularly in Fig. 3. ln the side of this reduced portion of the shank is provided a recess 41, located adjacent the shoulder 40, as shown in Fig. Ll, which is adapted to cooperate with a p in or projection 42, arranged within the spindle and located a short distance in rear of the chuck-jaws 9. The key or locking member 3 is .provided with the forward beveled or wedged-shape end 45, and its rear end eX- tends laterally and has a projection 46, eX- tending into an aperture formed in the hammer 23. When inserting a tool in the chuck, the operator moves the operating member or sleeve 1l rearwardly, carrying with it the hammer 23 and retracting the locking-piece or key S to the position shown in Fig. 3, when upon inserting the shank ol the tool 7 until the shoulder .110 thereon engages the projection 42- and rotating it a partial revolution the notch All will engage the pin 42, preventing the tool from being disengaged from the spindle until it has been rotated relatively thereto in the opposite direction, which movement, however, is normally prevented by the beveled end 45 ot the key or lockingpiece 3, which when projected. is held in a forward position in engagement with the tace 39 by the spring 30.

It the jaws 9 of the chucks are adjusted so that the shank of the tool is guided and Isupported to prevent its wabhling in. they handpiece, no further adjustment ot the chuck is required, as the tool is securely held by the locking devices just described; but il` the operator desires to Vfurther secure the tool this may be done qnitklfY by moving the sleeve 11 rearwardly until the projections `l 7 thereon interlock with vthe projections 2() on the collar 10, when the rotary motion given the spindle either manually or by means ol the motor devices to 'which it connected will cause the jaws of the chuck to he t losed, or the chuck may be tlosed by a relative rotary movement of the sleeve l] when the 4spindle is held stationary.

A dental handpiece embodying my improvements consists of iew parts whif` h are simple in construction and may be readily assembled to iorm a compact instrumentholder which is equally well adapted lor operating burring or plugging tools.

I claim as my invention'- l. In a dental handpiece, the eom'hhiation with a casing and a spindle therein, ot a tool cooperating with the spindle and a lurking device in the latter adapted to engage the tool, means for moving said devi ne into operative position and a sleeve extending exteriorly of the easing forming a bearing tor the spindle and movable into engagement with the locking device to disengage it from the tool.

ln a dental handpieee, the combination with a casing, a spindle journaled therein having jaws and a collar on the spindle tor adjusting them relatively to each other, oi a sleeve movably mounted in the casing and adapted to engage the collar and means l'or normally holding the sleeve out et engagement therewith. A

3, In a dental handpieee, the combination with a casing, a rotatable spindle journaled therein having jaws and a collar earried on the spindle for adjusting the jaws relatively to each other, of a longitudinally-moval le sleeve mounted in the casing and adapted to engage the collar, guides on the easing engaging the sleeve, means tor normally holding the latter out of engagement with the collar` 4. In a dental handpiece, the combination l ceive the projection, a locking device engag- 5o with a casing, a rotatable spindle journaled ing the end of the shank, means for yieldingly therein having jaws and a collar carried on holding the device in operative position, and the spindle for adjusting the jaws relatively. a sleeve extending forwardly and exteriorly to each other, of a longitudinally-movable j olf the casing and cooperating with said sleeve mounted in the casing and adapted to means to move the locking device into the engage the collar to hold it stationary relal inoperative position. tively to the spindle, means for preventing j 9. In a dental handpiece, the combinathe rotation of the sleeve in the casing and j tion with a casing, a rotatable spindle jourmeans for normally holding it out of contact j naled therein having tool-engaging devices with the collar. thereon, and an operating-sleeve movable on 5. In a dental handpiece, the combination l, the casing into engagement with said devices, with a casing, aV rotatable spindle journaled of a hammer carried on the spindle having a therein, clutch-jaws and a collar carried on k cam, a spring for moving the hammer in one the spindle and cooperating with the jaws to direction and an actuating member having adjust them relatively to each other, of protwo projections, one engaging the cam on the jections on the collar, a longitudinally-movp hammer and the other extending in rear ofi able sleeve carried in the casing and projectthe sleeve to prevent its longitudinal moveing exteriorly thereof and provided with proment in the casing. jections adapted to cooperate with those on 10. In a dental handpiece, the combinathe collar, means for preventing the rotation tion with a casing, a spindle journaled thereof the sleeve and means for holding the latter i in having tool-engaging devices thereon, and

a tip-piece in the casing having a rearwardlyout of engagement with the collar. j

6. In a dental handpiece, the combinal extending key,oi1 a sleeve movable longitution with a casing, a spindle therein, devices dinally in the tip-piece and provided with a on the spindle for engaging a burring-tool, of collar in rear of the tip-piece having a recess a member for adjusting said devices extendhtting the key, cooperating projections on ing exteriorly of the casing and adapted to the tool-engaging devices and the sleeve and j means for normally holding them out of enl i receive a plugging-tool and a hammer copergagement.

11. In a dental handpiece, the combinaating with the member.

7. In a dental handpiece, the combination with a casing, a hollowspindle journaled tion with a casing, a rotatable spindle jourtherein and having clamping-jaws, a collar naled therein and devices on the spindle ior on the spindle cooperating with the jaws to move them relatively to each other and a securing a tool thereto, of an operatingsleeve movable on the casing into engagement with said devices, said sleeve being projection in the spindle, of a tool having a adapted to support a tool, ahammer operj shank reduced at the end and provided with ated by the spindle and having a cam, means j a recess adapted to receive the projection, `a for moving the hammer in one direction and l locking-piece in the spindle engaging the end an actuating member cooperating with the of' the shank and a sleeve movable longitudicam to move the hammer in the other direcnally on the casing and cooperating with the tion which engages the sleeve to prevent it f collar and the locking-piece to disengage the from engagement with the tool-securing dei latter and means for moving said lockingvices on the spindle. piece into operative position and normally S. In a dental handpiece, the combinaholding the sleeve in the inoperative position. tion with a casing, a hollow spindle and a j HENRY S. MILLER. projection therein, of a tool having a shank l provided with a shoulder and an end projectj ing therefrom having a recess adapted to rei Witnesses:

G. WiLLARD RICH, RUSSELL B. GRIFFITH, 

